Activist Allans Ademba released on Sh20,000 cash bail after arrest in Ol Kalou, Defenders Coalition says camera and mobile phone still in police custody.
A coalition of human rights groups and civil society organisations has petitioned Parliament to investigate alleged extrajudicial killings, enforced disappearances and torture.
Human rights activists are set to march to Parliament on Tuesday to petition lawmakers over extrajudicial killings and enforced disappearances.
Human rights activists push back against claims reported victims are simply going into hiding, arguing the pattern points instead to a deliberate campaign of intimidation against government critics.
Activists have asked the High Court to block the government's planned sale of its 15 per cent stake in Safaricom, arguing it is unconstitutional, undervalued and threatens national interests.
Mathare social justice activist Davis Lichuma has been found alive after missing for more than three days.